_EC 1.2.2.- With a cytochrome as acceptor. 0 PDB entries  
EC 1.-.-.- Oxidoreductases. [21,435 PDB entries]
EC 1.2.-.- Acting on the aldehyde or oxo group of donors. [1,276 PDB entries]
EC 1.2.2.- With a cytochrome as acceptor. [-]
EC 1.2.2.1 formate dehydrogenase (cytochrome). [-]
EC 1.2.2.2 Deleted entry. [-]
EC 1.2.2.3 Transferred entry: 1.17.2.3. [-]
EC 1.2.2.4 Deleted entry. [-]

[-] signifies that there are no PDB entries for the given enzyme subclass